Patent GB-635211-A (GB)
Title: Improvements in or relating to depth sounding apparatus
IPC: G01S1/72
Filed: 1946-06-04
Abstract: 635,211. Echo-sounding and distance-measuring apparatus. SUBMARINE SIGNAL CO. June 4, 1946, No. 16904. Convention date, June 5, 1945. [Class 118 (ii)] An echo-sounding system in which the moment of signal transmission and the position of an indicator on a scale are automatically co-ordinated with each other and in which the scale is divided into sections and means are provided so that the correct scale section is presented for the depth being indicated, is characterized in that the said scale is made up of sections mounted longitudinally on a rotatable shaft turned simultaneously with the means for co-ordinating the moment of transmission and the indicator position. A manual switch arm 11 in the position shewn closes contacts 12 and so prepares the circuit of a transmitter 1 via transmitting contacts 7. A motordriven endless belt 18 carries an impulsing cam 16 which closes in turn the transmitting contacts 7 ... 10 and when the contacts 7 prepared by the switch 11 are closed a compressional wave impulse is transmitted. When the switch-arm 11 is turned to any position, cam 26 opens contacts 40, 41 and closes contacts 41, 61 which lock to prepare a circuit for a relay 62. A cam 27 mounted on the switch-shaft 25 then closes contacts 64 to energize the relay 62 and operate it after a delay of about 10 seconds. With an arm 47 retained in its normal, dotted, position by spring 53, contacts 45 are closed and the relay 62 therefore energizes a solenoid 44. Its core 51 is attracted and lowers the arm 47 and an associated U- shaped member 34, on which is an inking-plate 93, to the full-line position of Fig. 1. Simultaneously contacts 67 close and energize an electromagnet 65 which raises a printing-cam 28, its type-face 29 pressing the recording paper 21 against the inking plate 93 so that a scale is printed across the width of the recording paper 21 on the conductive roller 76 (shown for convenience at the bottom of Fig. 1). When an echo impinges on the receiver 2, amplified current lights a neon tube 4 and passes to a stylus 17 which marks the recording paper 21 adjacent the printed scale. After a short delay due to the dashpot 52, the lowering of the arm 47 opens contacts 45 again, thus deenergizing the solenoid 44 and allowing the printing member 34 to return to its normal position 341 where it momentarily closes contacts 38 against the pressure of a spring 56, to energize a solenoid 37 and close self-locking contacts 40, 41. These energize a delayed repeating relay 43 which after about 4 minutes operates to energize solenoid 44 and print another scale on the record paper 21 which has moved on, rendering the previous scale no longer visible. The neon tube 4 is mounted beneath the upper flat side of the endless band 18 in which, opposite the stylus 17, is a slot. When an echo is received, therefore, the slot is illuminated and the point it has then reached on an adjacent scale gives a visual indication of the depth of the sounding. If the depth is too great, the stylus will receive the echo current when it is off the recording paper 21 and similarly the neon lamp 4 will flash when the slot in the endless band 18 is off the adjacent scale. The switch-arm 11 is accordingly provided with three other positions, in which contacts 13, 14, or 15 are closed to prepare transmitting contacts 8, 9 or 10, respectively, which will then initiate an impulse at different intervals before the stylus 17 reaches the recording paper 21 and so allow the echo to arrive while the stylus is still on the paper 21. Cam 27 similarly has three other positions, in all of which the relay 62 is energized. Likewise, the printing cam 28 has three other surfaces bearing different scales, so that with the switch-arm 11 turned so that the stylus, marks the paper 21, the correct scale is printed alongside the mark. Similarly, four scales, mounted on four sides of a square shaft, co-operate with the neon tube 4, and a chain drive ensures that as the switcharm 11 is turned the correct scale becomes visible beside the endless band 18. In operation an operator turns the switch-arm 11 to the range he judges to be correct and waits a few seconds. If no stylus mark appears he turns to another range, and so on until he obtains a sounding record. Ten seconds after turning to this correct range, relay 62 will operate to print the correct scale and thereafter relay 43 will operate at four-minute intervals to re-print this scale. A detailed construction of the apparatus is shown and described.